皱纹盘鲍杂交幼鲍闽东内湾度夏初探

为探讨皱纹盘鲍杂交鲍幼鲍在闽东内湾度夏的生长与存活,以山东荣成两家育苗场培育的皱纹盘鲍Haliotis discus hannai杂交鲍幼鲍(XXK、DY)、福建东山岛培育的盘鲍H.discus discus幼鲍(DS)为材料,分别运输至福建霞浦内湾长腰海区、山东荣成爱连湾进行度夏培育.各幼鲍组XXK、DY、DS均为1龄苗种,起始壳长分别为31.51 mm±2.66 mm、30.76 mm±3.30 mm、30.63 mm±2.57 mm,且无显著性差异(P<0.05).经过6个月的培育,在南方闽东内湾培育条件下,皱纹盘鲍杂交鲍幼鲍组壳长的日增长率达95.34 μm/d±29.14μm/73.81 μm/d±29.37 μm/d,存活率为50.06%±0.25%、49.88%±0.17%;盘鲍组壳长的日增长率则为65.81 μm/d±29.71μm/d,存活率为28.81%±4.87%.作为对照,在北方培育条件下,皱纹盘鲍杂交鲍幼鲍组壳长的日增长率达67.85μm/d±29.01μm/d、63.749 μm/d±22.99 μm/d,存活率为78.90%±2.24%、86.56%±2.98%;盘鲍组壳长的日增长率则为27.87μm/d±29.21μm/d,存活率为43.19%±1.85%.双因素方差分析结果表明养殖环境与幼鲍来源,以及两者的交互作用均显著影响幼鲍度夏的生长发育.本研究结果对皱纹盘鲍杂交幼鲍在南方闽东内湾的养成提供了一定的参考.

Preliminary study on over-summering of juvenile hybrid Pacific abalone in east Fujian inner bay

Experiments on growth and survival of juvenile hybrid abalone(Haliotis discus hannai)during over-summer time in southern China were conducted in the present study. Two juvenile hybrid abalone H. Discus hannai Ino groups(XXK and DY)from commercial hatcheries in Rongcheng, Shandong Province, and one juvenile H. Discus discus group(DS)from a hatchery in Dongshan, Fujian Province were utilized as experimental materials in the study. Initial body sizes of each juvenile abalone group are near 3cm(SL, Shell lengths), and no significant differences were found among them. After 6 months experiment in southern environmental conditions, DGRs(Daily growth rates)by SL increments of groups XXL and DY were 95.34 μm/d±29.14 μm/d and 73. 81 μm/d±29.37 μm/d, respectively, while survival rates were 50.06%± 0.25% and 49.88%±0.17%, respectively. However, both DGRs by SL increments and survival rates of group DS were poor, which were only 65.81μm/d±29.71μm/d and 28.81%+4.87%, respectively. As a control, juvenile H. Discus hannai XXK and DY in northern environmental conditions had a higher survivalrate of 78.90%±2.24% and 86.56%± 2.98%, respectively, but little slower DGRs by SL increments of 67.85 μm/d±29.01 μm/d and 63.74 μm/d±22.99 μm/d, respectively. Similarly, juvenile H. Discus dis-cus had a poor growth and survival performance in northern environmental conditions. DGR by SL incre-ments and survival rate of juvenile DS were only 27.87 ±μm/d+29.21 μm/d and 43.19±1.85%, respec-tively. Two-way analysis of ANOVA showed effects of environmental condition, juvenile abalone group and the interaction between them have significant impacts on juvenile abalone growth and survival during over-summer times. The results of the present study can be helpful to the development of abalone production in-dustry in southern China.